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//! Job runner for futures and async functions
pub mod job_worker;
pub mod worker;
use core::future::Future;
use std::collections::HashMap;
use std::pin::Pin;
use std::sync::Arc;
use serde::{Deserialize, Serialize};
use tokio::sync::{mpsc, watch, Mutex};
use crate::error::Error;
use worker::WorkerProcessor;
pub use worker::{Worker, WorkerStatus};
pub(crate) type JobOutput = Result<(), Error>;
pub(crate) type Job = Pin<Box<dyn Future<Output = JobOutput> + Send>>;
/// Job runner for futures and async functions
pub struct BackgroundRunner {
send_job: mpsc::UnboundedSender<(Job, bool)>,
send_worker: mpsc::UnboundedSender<Box<dyn Worker>>,
worker_info: Arc<std::sync::Mutex<HashMap<usize, WorkerInfo>>>,
}
#[derive(Clone, Serialize, Deserialize, Debug)]
pub struct WorkerInfo {
pub name: String,
pub info: Option<String>,
pub status: WorkerStatus,
}
impl BackgroundRunner {
/// Create a new BackgroundRunner
pub fn new(
n_runners: usize,
stop_signal: watch::Receiver<bool>,
) -> (Arc<Self>, tokio::task::JoinHandle<()>) {
let (send_worker, worker_out) = mpsc::unbounded_channel::<Box<dyn Worker>>();
let worker_info = Arc::new(std::sync::Mutex::new(HashMap::new()));
let mut worker_processor =
WorkerProcessor::new(worker_out, stop_signal, worker_info.clone());
let await_all_done = tokio::spawn(async move {
worker_processor.run().await;
});
let (send_job, queue_out) = mpsc::unbounded_channel();
let queue_out = Arc::new(Mutex::new(queue_out));
for i in 0..n_runners {
let queue_out = queue_out.clone();
send_worker
.send(Box::new(job_worker::JobWorker {
index: i,
job_chan: queue_out.clone(),
next_job: None,
}))
.ok()
.unwrap();
}
let bgrunner = Arc::new(Self {
send_job,
send_worker,
worker_info,
});
(bgrunner, await_all_done)
}
pub fn get_worker_info(&self) -> HashMap<usize, WorkerInfo> {
self.worker_info.lock().unwrap().clone()
}
/// Spawn a task to be run in background
pub fn spawn<T>(&self, job: T)
where
T: Future<Output = JobOutput> + Send + 'static,
{
let boxed: Job = Box::pin(job);
self.send_job
.send((boxed, false))
.ok()
.expect("Could not put job in queue");
}
/// Spawn a task to be run in background. It may get discarded before running if spawned while
/// the runner is stopping
pub fn spawn_cancellable<T>(&self, job: T)
where
T: Future<Output = JobOutput> + Send + 'static,
{
let boxed: Job = Box::pin(job);
self.send_job
.send((boxed, true))
.ok()
.expect("Could not put job in queue");
}
pub fn spawn_worker<W>(&self, worker: W)
where
W: Worker + 'static,
{
self.send_worker
.send(Box::new(worker))
.ok()
.expect("Could not put worker in queue");
}
}
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